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TI-2026-28385 Aliases CVE-2026-39401

Privilege Escalation via update_event Job Output in Cronicle

Priority MEDIUM 57CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

Cronicle is a multi-server task scheduler and runner, with a web based front-end UI. Prior to 0.9.111, jb child processes can include an update_event key in their JSON output. The server applies this directly to the parent event's stored configuration without any authorization check. A low-privilege user who can create and run events can modify any event property, including webhook URLs and notification emails. This vulnerability is fixed in 0.9.111.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00185 8th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Cronicle (jhuckaby): 0.9.111

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
jhuckabyCroniclebefore 0.9.1110.9.111Patch availableCNA
  • Cronicle Vendorjhuckaby Affected before 0.9.111 Fixed in 0.9.111 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cronicle:cronicle:*:*:*:*:*:*:*:*before 0.9.111VulnerableCronicle
  • cpe:2.3:a:cronicle:cronicle:*:*:*:*:*:*:*:* Versions before 0.9.111 Vulnerable ·Cronicle

Remediation

  • Fix · CNA Cronicle (jhuckaby) Fixed in 0.9.111

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39401

References

Exploit 1

  • TI-2026-71909 Stored cross-site scripting in Cronicle admin Activity Log CVSS 3.1CRITICAL 9.0
  • TI-2026-81575 Cronicle lets non-admin users set run-as uid and gid in events CVSS 3.1HIGH 8.8
  • TI-2026-85660 Environment variable injection in Cronicle event params CVSS 4.0CRITICAL 9.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences